The U.S. House on Thursday voted to formalize its impeachment inquiry against President Trump.

Lawmakers adopted a resolution that lays out procedures for the inquiry that is already taking place in the House. That investigation is centered on whether the president abused his power by attempting to pressure the president of Ukraine to investigate Trump’s political opponent.

“The House impeachment inquiry has discovered a substantial body of evidence that the president of the United States has violated the Constitution by placing his political interests above the interests of the country, thereby putting both our democracy and the nation’s security in jeopardy,” said Rep. Jamie Raskin (D-Md.) during the floor debate. “In light of this evidence, the House of Representatives must fully investigate.”

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